/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/XRMotionControllerBase.h
These are overridden to call into the backward compatibility functions below. They are final and private because a legacy vr plugin would not use or implement these functions.
virtual bool GetControllerOrientationAndPosition &40; const int32 ControllerIndex, const FName MotionSource, FRotator & OutOrientation, FVector & OutPosition, float WorldToMetersScale &41; const